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Old 11-07-2014, 09:35 AM   #61
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Elco already has the solution right here: The EP Hybrid Electric Serial System - Elco Motor Yachts
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Old 11-07-2014, 09:39 AM   #62
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Now there's an idea. A wind generator on a boat to charge a battery to keep an electric boat going. Anybody see anything wrong with that idea?
Seems like a free energy scam to me...if you could figure that out ExxonMobil may take you out with sniper fire
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Old 11-07-2014, 09:43 AM   #63
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Pray, tell us more about your thinking. I do suspect wind power would be better at anchor and really meant to pitch solar panels but wind should make good augmentation. One of posters, I believe Mule, has both solar and wind.
My thinking is that it would be the classic perpetual motion machine. Any wind generated electricity resulting from the boat's forward motion would be at the expense of the battery powering the boat.

Wind is fine at anchor or at a dock (except for the noise) and of course solar panels are fine if you have a place to put them. Neither is very efficient at this point in time and neither is going to add significantly to the range of an electric boat of this size.
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Old 11-07-2014, 09:45 AM   #64
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Seems like a free energy scam to me...if you could figure that out ExxonMobil may take you out with sniper fire
I should have put a at the end of that post.
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Old 11-07-2014, 09:46 AM   #65
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Wind Generator with a DC fan mounted behind it so it will work even when the wind is not blowing.
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Old 11-07-2014, 10:19 AM   #66
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I should have put a at the end of that post.
It exists on the interweb...

I wonder how far that will motor? Did Toyota introduce an electric motor to market that operates above 100% efficiency???


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Old 11-07-2014, 10:40 AM   #67
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My thinking is that it would be the classic perpetual motion machine. Any wind generated electricity resulting from the boat's forward motion would be at the expense of the battery powering the boat.
Admittedly, wind won't help much underway but the wind generators rotate to the direction of the wind. If you are making 6 knots and there is a 15 knot following wind, you should get some charge, right? Never meant to suggest perpetual motion.

But you are right, best use is at anchor or at dock unless you are a sailboat guy.
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Old 11-07-2014, 10:49 AM   #68
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Popular topic!

Just so you'll know, I chose the Elco motor because my boat is an Elco & I have a strong commitment to the company, obviously.

Re wind, I asked about that & my yard crew dismissed it. They also dismissed solar. They have my best interest in mind, including my budget! The latter is most important.
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Old 11-07-2014, 10:55 AM   #69
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Use solar and mount a bank of LED lights shining down on it for night powering.
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Old 11-07-2014, 11:01 AM   #70
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Use solar and mount a bank of LED lights shining down on it for night powering.
You can't do that, must use incandescent for perpetual light driven electricity generator!
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Old 11-07-2014, 11:14 AM   #71
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I'm trying to figure out - if you can put gasoline in a generator and produce electricity, could you turn the generator with an external source and produce gasoline?
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Old 11-07-2014, 12:59 PM   #72
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I think one of these should do it . . . .

I can't believe I'm actually posting this
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Old 11-07-2014, 01:20 PM   #73
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Hi DJ, the Elco EP-1200 is what was recommended for my boat by Elco & my yard, so I have to assume it's the right engine. They assure me I'll have ample range at 6-7 knots for 4 hours.

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The ELCO motor that you have chosen uses 48 V at 106 amps DC maximum. But the motor itself is alternating current, not DC. You will need some kind of inverter/controller to make AC from the DC battery supply. The ELCO site says that you use four 12V batteries to power the motor. That means that you cannot use 6, 12V batteries which gives you 72 volts. You have to use them in groups of 4 for 48 volts.


Could be easily explained; perhaps the implementation will be 4 batteries for propulsion, 2 for house loads.

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Old 11-07-2014, 03:39 PM   #74
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Here's what a 22 foot cuddy cabin all electric launch has...


22 Cuddy Cabin

Length: 22' - 0"
Beam: 9' - 3"
Draft: 29"
Capacity: 12 Adults
Displacement: 4,315 lbs.
Top Speed: 6.0 MPH
Running Time:
@ Cruising Speed: 12.5 hours
@ Top Speed: 6.5 hours

48-volt DC Motor
6-volt Deep Cycle Marine Batteries (16)

A guy I know has one of these and there are a boatload of batteries...he may have even added more even though he never goes far.

One possible solution...2 banks... use one till it's down...start using the other and start charging the first. That way you always have an emergency backup in case of a bank malfunction and you can control the charge rate better on a smaller, non loaded bank ...I would think.

Not only practical electric boats are here, they have been around awhile, and are getting better every day.

Is it a loop boat? Probably not, but not every boat is good for every use.
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Old 11-07-2014, 04:39 PM   #75
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.............One possible solution...2 banks... use one till it's down...start using the other and start charging the first. That way you always have an emergency backup in case of a bank malfunction and you can control the charge rate better on a smaller, non loaded bank ...I would think.
Let's keep in mind that it's very hard on the batteries to discharge them more than 50% and even then, you need to recharge them quickly for longest life.

For practical purposes, a 400 AH battery bank is only good for 200 AH, 800 AH good for only 400 AH, etc.

Yes, you can build an electrically powered boat. Fill the bilge with 1,000 lb of batteries and you can cruise all day but you still need to tie up at a marina and recharge the batteries every night.

I suppose you could go experimental and buy a bunch of lithium ion batteries but they are very expensive and more than a few have caught fire.

The auto industry, both here and abroad have spent years and millions of dollars trying to produce an electric car. So far, they have not come up with anything practical and cost effective except maybe for riding around town.

If a practical electric powered boat ever becomes available it will be using technology yet to be developed by the auto industry.

Yes you can build an electric powered boat today but the only reason to do so is to be able to say you did it. It's not going to be practical for most folks.
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Old 11-07-2014, 04:52 PM   #76
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Now that I'm realizing it's a 48V motor... looks like the mainstream options might be something like:

-4x 12V 8Ds @ ~245 Ah
-8x 6V GCs at ~220 Ah (maybe not a great option)
-8x tall 6V GCs at ~300 Ah
-8x tallest 6V GCs at ~400 Ah
(all pretty within the same basic length x width footprint)

So somewhere between 120-200 Ah (48V) at no less than 50% discharge.

I think it'd be quite attractive to be able to putter around many of our creeks and rivers quietly. Or for a pleasant 30-minute run to OP's nearest pleasant anchorage for a quiet overnight on the hook. Or for harbor cruises and so forth.

That's not a "let's head down the ICW and cross over to the islands" kind of boat... but not everyone wants/needs one of those...

I hadn't noticed before, but it's intriguing to now see Elco offers some interesting electric outboards. I could see something like that on our big canoe, for duck hunting... or for trash pickup when we have a river-keeper kind of day. Our current 2-stoke 5-hp gas outboard is a more mainstream solution, but it's not the quietest thing in the world, ethanol is a pain in the a$$, but OTOH Elco is pretty proud of their 5-hp model (like about 3x the cost of our gas outboard, not counting the batteries). Still, "quiet" is a very desirable virtue.

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Old 11-07-2014, 05:01 PM   #77
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The auto industry, both her and abroad have spent years and millions of dollars trying to produce an electric car. So far, they have not come up with anything practical and cost effective except maybe for riding around town.
For some reason the vast majority of people did not pay attention in science class. I was a Toyota technician when the first Prius came to market. Sure you get regen braking to recoup lost energy during acceleration. Sure you get start/stop features to not burn fuel idling. Maybe that nets you 10-20% real world savings in miles per gallon.

At the end of the day you still have a primary propulsion system that wastes 2/3rds of the BTU energy out the exhaust and radiator as heat. We can never get around that no matter what how you skin the cat. The ONLY way cars will ever become drastically more efficient in a scenario where recharging or electric generation (like a Volt) is out of the question is fuel cell. You atomically gather a bunch of electrons in a near perfect manner and send them through a motor which is upwards of 80-90% efficient. It's the only way right now it can be done in my opinion. Any constant duty long running energy demand cannot be met with some type of hybrid system (in a small scale like a vehicle) with an internal combustion engine.
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Old 11-07-2014, 05:15 PM   #78
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Well Duffy boats has done ok...obviously a more specialized boat than most would buy (unlike cars that need to be more practical or specialized to do well for mass production).

Not every cruiser does 100 miles a day, or needs to go 8+ knots ,or is counting the days till they leave on a long voyage.

But some well off folk like to glide around in silence and are buying them, and rental fleets are doing well. Check out their site for a business opportunity...oh that's right, they aren't practical.
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Old 11-07-2014, 05:19 PM   #79
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For some reason the vast majority of people did not pay attention in science class. I was a Toyota technician when the first Prius came to market. Sure you get regen braking to recoup lost energy during acceleration. Sure you get start/stop features to not burn fuel idling. Maybe that nets you 10-20% real world savings in miles per gallon.

At the end of the day you still have a primary propulsion system that wastes 2/3rds of the BTU energy out the exhaust and radiator as heat. We can never get around that no matter what how you skin the cat. The ONLY way cars will ever become drastically more efficient in a scenario where recharging or electric generation (like a Volt) is out of the question is fuel cell. You atomically gather a bunch of electrons in a near perfect manner and send them through a motor which is upwards of 80-90% efficient. It's the only way right now it can be done in my opinion. Any constant duty long running energy demand cannot be met with some type of hybrid system (in a small scale like a vehicle) with an internal combustion engine.
Exactly. With a very large investment in time and money, fuel cells or vastly improved batteries are likely to become available and practical. This is not going to happen in the next few years.
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Old 11-07-2014, 05:22 PM   #80
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Well Duffy boats has done ok...obviously a more specialized boat than most would buy (unlike cars that need to be more practical or specialized to do well for mass production).

Not every cruiser does 100 miles a day, or needs to go 8+ knots ,or is counting the days till they leave on a long voyage.

But some well off folk like to glide around in silence and are buying them, and rental fleets are doing well. Check out their site for a business opportunity...oh that's right, they aren't practical.
Yes, I saw a couple Duffy boats on my recent cruise. Nor cruising but in a marina in downtown Baltimore. They would take people out an harbor tours. That's a good use for them. I can't begin to comprehend someone taking an electric powered boat on the ICW from Norfolk to Miami.
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